Jack stand



FIG. 1 is a perspective view of my new design.

FIG. 2 is a right side view thereof.

FIG. 3 is a left side view thereof.

FIG. 4 is a front view thereof.

FIG. 5 is a rear view thereof.

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a top plan view thereof. 

The ornamental design for the jack stand, as shown and described. 